pmdalio is a Performance Metrics Domain Agent (PMDA) which
exports metric values about the Linux I/O target subsystem, which
provides for protocols like iSCSI, FCP, FCoE. These allow
storage available on one host to be exported and consumed by
other hosts using industry standard protocols.
This PMDA exports summary metrics which are performance value
aggregations and configuration per LIO target instance.
Additionally, it provides per LUN performance metrics including
IOPS, and READ and WRITE throughput.
The LIO configuration is maintained within the kernel's configfs
virtual filesystem. The python-rtslib module provides an
interface to configfs, allowing tools like pmdalio to interact
with the settings and metadata held in configfs.
Install the lio PMDA by using the Install script as root:
# cd $PCP_PMDAS_DIR/lio# ./Install
To uninstall, do the following as root:
# cd $PCP_PMDAS_DIR/lio# ./Removepmdalio is launched by pmcd(1) and should never be executed
directly. The Install and Remove scripts notify pmcd(1) when the
agent is installed or removed.
installation script for the pmdalio agent
undo installation script for the pmdalio agent
default log file for error messages from pmdalio
Environment variables with the prefix PCP_ are used to
parameterize the file and directory names used by PCP. On each
installation, the file /etc/pcp.conf contains the local values
for these variables. The $PCP_CONF variable may be used to
specify an alternative configuration file, as described in
This page is part of the PCP (Performance Co-Pilot) project.
Information about the project can be found at
⟨http://www.pcp.io/⟩. If you have a bug report for this manual
page, send it to firstname.lastname@example.org. This page was obtained from the
project's upstream Git repository
⟨https://github.com/performancecopilot/pcp.git⟩ on 2021-08-27.
(At that time, the date of the most recent commit that was found
in the repository was 2021-08-27.) If you discover any rendering
problems in this HTML version of the page, or you believe there
is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
Performance Co-Pilot PCP PMDALIO(1)